© 2002 by Heart
EDITORIAL
Automated cardiac flow measurement by digital colour Doppler echocardiography
Correspondence to:
Correspondence to:
Dr Takahiro Shiota, Department of Cardiovascular Medicine / F15, The Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, OH 44195, USA;
shiotat@ccf.org
Quantification of cardiac flow volumes, such as stroke volumes and cardiac outputs, has had a major impact on the management of patients with cardiac diseases
Keywords: colour Doppler; cardiac output; digital; ultrasound; haemodynamics
| The first 150 words of the full text of this article appear below. |
In the 1980s, the development of Doppler echocardiography, especially pulsed wave Doppler techniques, provided significant progress in determining cardiac flow volumes.1–3 The pulsed wave Doppler method is based on a simple mathematical principle, which multiplies a flow area by its velocity during the flow time (velocity–time integral) to estimate a flow volume.1–3 This Doppler method assumes a spatially flat flow velocity distribution and a constant flow area during the entire time of flow. However, the spatial velocity profile is not necessarily flat and the flow area may change during the time of flow.1–3
In the 1990s, a digitally automated cardiac flow measurement method was developed to overcome these shortcomings of the conventional pulsed Doppler method.4–11 This new method uses not only a single central point but also multiple Doppler points in space along the diameter of the flow; it also uses several imaging frames during the time of flow, accounting
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